Awww... that's kind of cute. There is such a thing as a healthy obsession. I mean, dear God, she could have been one of those Twilight losers.
Unless she has a hoard of Zootopia merch, 100's of MB of screencaps, 8,000+ pieces of fanart, & hangs out on the Zootopia /co/ discord channel, she's only got a light touch of obsession. Nothing to worry about. :^)